Robust and Multifunctional Ti3C2Tx/Modified Sawdust Composite Paper for Electromagnetic Interference Shielding and Wearable Thermal Management

• Published in: Small (Weinheim an der Bergstrasse, Germany) Vol. 20; no. 3
• Main Authors: Wang, Pei‐Lin, Mai, Tian, Zhang, Wei, Qi, Meng‐Yu, Chen, Lei, Liu, Qi, Ma, Ming‐Guo
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01.01.2024
• Subjects: Artificial intelligence; electric/solar heating; Electromagnetic interference; electromagnetic interference shielding; Electromagnetic shielding; Environmental management; Hydrogen bonding; Mechanical properties; Nanocomposites; Ohmic dissipation; Photothermal conversion; Resistance heating; Robustness; Sawdust; sensing; Stealth technology; thermal camouflage; Thermal management; Ti3C2Tx MXene; Vacuum filtration; Wearable computers; Wearable technology; wood sawdust
• ISSN: 1613-6810; 1613-6829
• DOI: 10.1002/smll.202304914

Robust, ultrathin, and environmental‐friendliness papers that synergize high‐efficiency electromagnetic interference (EMI) shielding, personal thermal management, and wearable heaters are essential for next‐generation smart wearable devices. Herein, MXene nanocomposite paper with a nacre‐like structure for EMI shielding and electrothermal/photothermal conversion is fabricated by vacuum filtration of Ti3C2Tx MXene and modified sawdust. The hydrogen bonding and highly oriented structure enhance the mechanical properties of the modified sawdust/MXene composite paper (SM paper). The SM paper with 50 wt% MXene content shows a strength of 23 MPa and a toughness of 13 MJ·M−3. The conductivity of the SM paper is 10 195 S·m−1, resulting in an EMI shielding effectiveness (SE) of 67.9 dB and a specific SE value (SSE/t) of 8486 dB·cm2·g−1. In addition, the SM paper exhibits excellent thermal management performance including high light/electro‐to‐thermal conversion, rapid Joule heating and photothermal response, and sufficient heating stability. Notably, the SM paper exhibits low infrared emissivity and distinguished infrared stealth performance, camouflaging a high‐temperature heater surface of 147–81 °C. The SM‐based e‐skin achieves visualization of Joule heating and realizes human motions monitoring. This work presents a new strategy for designing MXene‐based wearable devices with great EMI shielding, artificial intelligence, and thermal management applications. A TDS/MXene (SM) paper is prepared by Ti3C2Tx and modified sawdust as the smart wearable device, showing a strength of 23 MPa and an EMI SE of 67.9 dB. The SM paper achieves a high Joule heating and photothermal temperature and exhibits notable infrared stealth performance, camouflaging a high‐temperature. The paper‐based e‐skin visualizes Joule heating temperature and monitors human motions.